From 8b3af4ea3647832046e7f140c78181986429aea9 Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Thu, 28 Jun 2007 23:03:45 +0200
Subject: [PATCH] Implemented a limit on number of submits of a single task
 part.

---
 TODO              | 1 -
 submit/commands.c | 7 +++++++
 submit/config     | 4 ++++
 submit/submitd.c  | 4 +++-
 submit/submitd.h  | 1 +
 5 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/TODO b/TODO
index 6364c45..f31fbe3 100644
--- a/TODO
+++ b/TODO
@@ -18,7 +18,6 @@ Installer:
 
 New submitter:
 - Checking of contest time (and per-contestant exceptions)
-- Remember hashes
 - contest: override failed check
 - contest: local history
 - contest: task status cache
diff --git a/submit/commands.c b/submit/commands.c
index cf4ace6..bee9549 100644
--- a/submit/commands.c
+++ b/submit/commands.c
@@ -207,6 +207,13 @@ cmd_submit(struct conn *c)
   struct odes *tasko = task_status_find_task(c, task, 1);
   struct odes *parto = task_status_find_part(tasko, pname, 1);
   uns current_ver = obj_find_anum(parto, 'V', 0);
+  if (current_ver >= max_versions)
+    {
+      err(c, "Maximum number of submits of this task exceeded");
+      bclose(fb);
+      task_unlock_status(c, 0);
+      return;
+    }
   uns last_ver = 0;
   uns replaced_ver = 0;
   for (struct oattr *a = obj_find_attr(parto, 'V' + OBJ_ATTR_SON); a; a=a->same)
diff --git a/submit/config b/submit/config
index 1b00f46..578c856 100644
--- a/submit/config
+++ b/submit/config
@@ -21,6 +21,10 @@ MaxRequestSize		4K
 # This is a default, which can be overriden in task definitions.
 MaxAttachSize		256K
 
+# Maximum number of versions of a single task part a contestant is allowed
+# to submit (0=unlimited)
+MaxVersions		50
+
 # Number of bits for the Diffie-Hellman key exchange
 DHBits			1024
 
diff --git a/submit/submitd.c b/submit/submitd.c
index 9160cf9..f373618 100644
--- a/submit/submitd.c
+++ b/submit/submitd.c
@@ -30,6 +30,7 @@ static uns port = 8888;
 static uns dh_bits = 1024;
 static uns max_conn = 10;
 static uns session_timeout;
+uns max_versions;
 static byte *ca_cert_name = "?";
 static byte *server_cert_name = "?";
 static byte *server_key_name = "?";
@@ -68,6 +69,7 @@ static struct cf_section submitd_conf = {
     CF_UNS("SessionTimeout", &session_timeout),
     CF_UNS("MaxRequestSize", &max_request_size),
     CF_UNS("MaxAttachSize", &max_attachment_size),
+    CF_UNS("MaxVersions", &max_versions),
     CF_STRING("CACert", &ca_cert_name),
     CF_STRING("ServerCert", &server_cert_name),
     CF_STRING("ServerKey", &server_key_name),
@@ -167,7 +169,7 @@ tls_new_session(int sk)
   int err;
 
   err = gnutls_init(&s, GNUTLS_SERVER); TLS_CHECK(gnutls_init);
-  err = gnutls_set_default_priority(s); TLS_CHECK(gnutls_set_default_priority);			// FIXME
+  err = gnutls_set_default_priority(s); TLS_CHECK(gnutls_set_default_priority);
   gnutls_credentials_set(s, GNUTLS_CRD_CERTIFICATE, cert_cred);
   gnutls_certificate_server_set_request(s, GNUTLS_CERT_REQUEST);
   gnutls_dh_set_prime_bits(s, dh_bits);
diff --git a/submit/submitd.h b/submit/submitd.h
index 42a8e53..6078eb9 100644
--- a/submit/submitd.h
+++ b/submit/submitd.h
@@ -50,6 +50,7 @@ struct conn {
 };
 
 extern uns max_request_size, max_attachment_size, trace_commands;
+extern uns max_versions;
 extern byte *history_format;
 
 /* submitd.c */
-- 
2.39.5